Saying we're more interconnected and that it's important to support stability doesn't mean that I support US hegemony, the domino theory and the need for military intervention everywhere. In fact I'm quite against US military action abroad, certainly in places like Iraq and Vietnam where it had no business being. But in this case, if a country like Russia is able to push its way into Ukraine unopposed, it does threaten the stability of Europe (a place where warfare was almost continuous going back millennia) which is a ReallyBadThing for Europe and for the US (and I don't mean for US hegemony, but for the US economy and wellbeing).